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Currently out of stock on all Continuity Tester (+ Tin) products. We will be sourcing more soon.

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The Continuity Tester

This is a very useful, easy to build, small device. It allows quick testing of continuity. Ideal for testing out any new circuits you build before power is applied to them. It also gives an audible representation of resistance values. For example a short circuit will give the highest tone of approx 2Khz where as a 5k resistance will give a tone at about 1Khz with 80K giving a 100hz tone.

The current flowing through the leads is very small, hence this device can be used around semiconductor devices without fear of damage.

This is a conventional astable 555 circuit with the test leads in series with the charging resistor, the output is used to drive the output of a small 75 ohm loudspeaker or piezo speaker. The video below describes the circuit in more detail.

Because the current through test leads is directional, from positive to negative, the circuit can be used for the testing of LEDs and diodes or simple "diode" testing of transistor junctions.

All kits that you buy will all come with two detailed videos, one will describe the theory the second video will show how to drill and adapt the tin so your board fits within it. (both videos displayed on this page below)

Kit parts are as follows:
  • 1 of PCB board
  • 2 of 1K0 Resistors (R1,R2)
  • 1 of 0.22uf Capacitor C1
  • 1 of 0.1uf Capacitor C2
  • 1 of 100uf Electrolytic Capacitor C3
  • 1 of IC 555 timer
  • The tin (96mm x 60mm x 21mm)
  • 1 of Battery Clip
  • Assembly instructions

The theory behind the circuit

The theory video is not required to get your circuit running. Those who are not interested in how the circuit works can just use the assembly instructions and refer to the second tin installation video for tips and an example on how to install the circuit within a typical enclosure. The theory is just an extra bonus video for those who like to know how their kits work.

NOTE: Video below is in HD quality so please view it in full size for best effect.

Tin Installation Video

NOTE: Video below is in HD quality so please view it in full size for best effect.


All kits that you buy will all come with a tin as an enclosure. (96mm x 60mm x 21mm) This short video goes through some suggestions on how to install your finished circuit into a typical enclosure. Often the tins used in the installation videos is a smaller tin for demonstration purposes. But you will always receive the larger tin version.